FAFAAWFF New Upgrade Windshield Repair Kit, for Repair Half-Moon Cracks, Cobwebs, Star-Shaped Damage, Long Line Crack

Q: What is the purpose of the push pin?

to remove any small shard left in the crack/chip.

Q: How many chips will this kit do can you by more liquid

I don't know how long the resin stay liquid once you open the tube, it's not resealable. If it worked it could fill in quite a number of small cracks and dings, but it did not work for me. This one leaked the resin all over the place and ended up a mess.